Nail.



No. 718,934. PATENTBD JAN. 20 1903. E. H. IMLAY.

NAIL.

APPLICATION IILIID APR. 21, 1962.

Unrrnn STATES ATENT OFFICE.

EDIVARD II. IMLAY, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR OF ONE-HALF TOADELAIDE IMLAY HEWITT, OF MINNEAPOLIS, MINNESOTA.

N Al L.

SPECIFICATION forming part of Letters Patent N 0. 718,934, dated January20, 1903.

Application filed April 21,1902. Serial No. 103,895. (No model.)

.-.0 all whom it nut/y concern.-

which are circumscribed bya cylinder which 45 Be it known that I, EDWARDI-I. IMLAY, a coincides with the body and point of the nail.

citizen of the United States, residing at Minneapolis, in the county ofHennepin and State of Minnesota, have invented certain new and usefulImprovements in Nails; and I do hereby declare the following to beafull, clear, and exact description of the invention, such as willenable others skilled in the art to which it apro pertains to make anduse the same.

My invention has for its object to provide a twisted nail of improvedconstruction; and to this end it consists of the novel devices andcombinations of devices hereinafter described, and defined in the claim.

The invention is illustrated in the accompanying drawings, wherein likecharacters indicate like parts throughout the several views.

Figure 1 is a view in side elevation, showing the nail before it hasbeen twisted. Fig. 2 is a section on the line :12" 13 0f Fig. 1. Fig. 3is a section on the line m 00 of Fig. 1, and Fig. 4 is a side elevationof the completed nail.

The numeral 1 indicates a wire nail which is of ordinary constructionexcept that at its intermediate portion it is flattened and twisted inthe following manner: The upper sec- 0 tion of the nail and the pointare left intact or of the form given to an ordinary Wire nail, while avery considerable section of the nail is flattened, as indicated at 2.This flattened portion is preferably square in cross-section,

as best shown in Fig. 3. Where the squared portion joins with the shortcylindrical section 1 at the point of the nail, there is formed ashoulder 1". (Best shown in Fig. 4:.) The squared or flattened portionof the nail is 40 twisted, as shown in Fig. 4, being preferably givenabout one complete turn. By reference to Figs. 1 and 2 it will be notedthat the flattened or squared portion 2 of the nail has a cross -sectionthe angular projections of In virtue of this construction the twisted orauger-like section of the nail cannot possibly cut a hole which islarger than the body of the nail. This construction I consider very 5oimportant.

I have found that a nail constructed as above described may be easilydriven, but can be pulled out only when great force is applied thereto.When the nail is driven, it is rotated slightly, and to withdraw thesame it must be given a reverse rotation. Furthermore, the shoulder 1makes the withdrawal of the nail more difficult than if the same werenot provided. When the wood sets around the driven nail, it will holdthe same under very great friction. However, when the nail is driven itdoes not break the fiber of the wood to any great extent, but has moreof a tendency to press the same laterally out of its path.

Nails may he formed as above described at small cost, and I have foundin practice that such nails have greater holding efficiency than wirenails differently constructed.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is as follows:

The wire nail 1 ,the body and the end portion 1 formed cylindrical andhaving the intermediate fiattened and twisted section 2, thecross-section of said flattened twisted portion having its cornerscircumscribed by the cylindrical surface coinciding with the body andend portions of the nail, said nail having also the shoulder 1 at thejunction of said sections 1 and 2, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

EDWARD H. IMLAY.

WVitnesses:

ELIZABETH KELIHER, F. D. MERCHANT.

